The purpose of the article is to give an accurate assessment of speed-strength and technique in dolphin style swimmers. Materials and methods: When searching for more advanced technical options that correspond to the age and physical fitness of an athlete, it is necessary to apply methods that would give a clear picture of the current trends and create an image of the future sports movement of the swimmer. The research is based on a methodology of forced external dynamic resistance. The results were obtained with the help of a unique device designed and manufactured by the department of physical education and sports and department of instrument engineering of the South Ural State University. The technique of forced external dynamic resistance was used. Simultaneously with the speed-strength data, underwater video was recorded in the frontal and sagittal planes. Computer processing of the material was used. Results: the work proves the effectiveness of the technique of forced external dynamic resistance. Conclusion. The use of electronic dynamometry and a pressure recorder allow conducting research in the field of special physical and technical fitness of swimmers and providing their objective assessment.